14.21 and Cell Diagrams/Standard Potentials

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Alexia Joseph 2B
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Joined: Thu Jul 27, 2017 3:01 am

14.21 and Cell Diagrams/Standard Potentials

Postby Alexia Joseph 2B » Mon Feb 19, 2018 9:34 pm

How come for both of the half reactions derived from the cell diagram, you add the electron in both cases? Shouldn't the left side of the cell diagram be an oxidation reaction, in which the species loses an electron instead of gaining an electron?

Nancy Dinh 2J
Posts: 59
Joined: Fri Sep 29, 2017 7:07 am

Re: 14.21 and Cell Diagrams/Standard Potentials

Postby Nancy Dinh 2J » Mon Feb 19, 2018 10:43 pm

Alexia Joseph 2B wrote:How come for both of the half reactions derived from the cell diagram, you add the electron in both cases? Shouldn't the left side of the cell diagram be an oxidation reaction, in which the species loses an electron instead of gaining an electron?


Yes, but they're usually written with the electron added because we usually calculate E when the half reaction is a cathode. It eliminates the redundancy of calculating E as an anode too. When you added the two half reactions, make sure you flip the right equation but remember, DO NOT FLIP THE SIGN FOR E.


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